Steam-engine.



EATBNTBD SEPT. 29, 1903.` G. Lomax.

Y Y STEAM Emma APP-LIVOATIOH FILED HAR. 1,l 1902. BEXEWEB APB. Q. 1903.

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UNITED Grenen P, CLARK, oF NEW YORK,l N. Y., AssieNoR or ospitate To 4 E. MANN VYNNE, OF NEYV YORK, N. Y.

, STEAM-cuernos.v

A 5 SPECIFICATION forming part of Letters Patent N o. 740,089, dated September 29, 1903.

Application iled M'arc'n 1,1902. Renewed April 6, 1903. Serial Eo. 151,413. (Xo model.)

To all ufhonb it may concern: 'Y

13e itknown thatI, GEORGE P. CLARK-,a citizen of the United States,residing at New York, in the county and State of Kew York, have invented certain new and useful Improvements in Steam-Engines, of which the following isa specification. y

This invention relates to steam-engines, and particularly to those of a low-speed type, and has for its object to provide an improved steam-engine of the class described in which there is a direct continuous exertion of the power and in which there is no dead-center.

In the drawings, Figure 1 is a central longitudinal sectional View of a cylinder and piston embodying my improvements. Fig. is a sectional view on the line az, Fig. 1. Fig. Fig. -1 isa side elevation of the same. Fig. 5 is a sectional view on the line wir, Fig. 4. Fig. 6 is a sectional view on the line fr, Fig. 5, with parts broken away. Fig. 7 is a side elevation showing a modification of certain parts of the invention. Fig. S is a detaii view of a portion of the chain and one ot' the rollers.

Corresponding parts in all the figures are denoted by the same reference characters.

Referring to the drawings, 1 designates a cylinder having extended from its heads 2 hollow sleeves 3. The cylinder 1 maybe su pported in any suitable manner. A pistonhead 1 works in the cylinder 1 and is provided with the usual packing The piston-head 4 has an opening 6, bored transversely through suoli head, whichopeningr isinteriorlyscrewthreaded for a distance irom each end. A plug 7 screws in cach end o said opening;r and is provided with a rectangular recess S in its lower part. The inner wail of such recess at the top is case-hardened- Extending through the central portion of the piston-head in alinement with the opening 15 are two spaced openingsl, through whic'na sprocket-chain 20 passes. Surrounding Said chain 2O and extending from cach side or' the piston-head -i is a hollow cylindrical sleeve 1l, which passes into the sleeve Bored centrally through the pistou-head l is a hele 1i, one end o which is of smaller diameter than the remainder of said Vhole 12. A shaft 13 passes through said hole 12 and has its end iournaled in the portion of the hole 12 of small-er diameter and carries an enlarged cylindrical portion 14, the outer surface of which is inclined ataugle to the axis of theshaft 13. A cap l5 STATES forms a bearing for the shaft'13 on the opposite side of the enlargement l-L and is secured in place by setscrews passing through the piston head transversely to the opening G.

v'The shaft 13 extends outwardly from the piston-head -L through one of the hollow sleeves 11 and has a bearing near its end in a pla-te 16, secured across the end of the sleeve 11. A small gear 17 is mounted upon the end of the shaft 13. Theplate 1G extends at one side through a longitudinal slot 1S in the side of one of the-sleeves Mounted at the outer end of the plate 1G is a wheel 1), operated by a handle a and having on a portion of its periphery teeth 21. Mounted upon the plate 1G is an idler-gear' 22,

the wheel 19. The chain 2d has one surface smooth which bears against the enlargement y 1l and the other surface substantially corrugated transversely or having spaced nequalities therein, which uneven surface is in engagement with the rollers 23, which are seated in the recesses in the plugs 7. suitably mounted with reference to the ends or' the .sleeves v3 are shafts 24, carrying sprocketwheels :25, over which the chain 2O passes. One of the shafts 2t also has the drivingwheel 2G mounted thereon. suitably mounted to guide the chain 2G into the sleeves 1l. The cylinder 1 is provided at each end with an opening 2S, from which a. pipe *29 leads to a four-way valve 30, connected by a pipe 3l with a suitable steamsupply (not shown) and with a. suitable exhaust-chamber (not shown) by a pipe 33. Means are provided for operating the valve 30 to open communication between the steampipe 3l and the opening 2S at one end of the cylinder at. the same time that communication' is opened between the openin" at the which meshes with the gear 17 and-the toothed portion of ldlers 2. are' other end of the Cylinder and the exhaust- 'a plunger 3i slidably mounted and working through the other end. Adj-ustabiysecured upon Vthe tnbe 33 isa collar 35, the

lower end of which moves in a gnideway 36,

- provided at either end with suitable cushionstops 37. link 3S with the valve-stem 30a bya pinand-slot connection. The tube 33 is provided Fig. 7 in wh ich there are two cylinders 41 and e2, each of which is open at one end andV has a hollow sleeve projecting from only one end. The cylinders 4l and 42 are placed with their closed ends adjacent, the hollow sleeve of one projecting parallel with the body portion ofthe other. It is evident that in this construction the chain O will-pass only once through cachot the cylinders, and therefore only one opening 9 through the piston-head and one roller 23 will be necessary for each piston-head 1t and that there will be only one hollow sleeve projecting from said piston-head. The advantage of this modified form of construction is that the chain 20 can be lcd through the cylinders l1 and 42 into planes substantiall)- tangentially to the peripher of the sprocketwheels 25.

The operation and advantages of my inven-` tion are readily appreciated and understood. The parts being in the position shown in Fig. 1, steam is'turned on, and entering the cylinder 1 through the valve 30 and -pipe 39 drives the head t toward the opposite end of the cylinder 1. As the head L moves in that direction the upper span of the chain 20 is gripped between the roller 23 and the surface of the enlargement 14 and carried along with the head i. The head l also carries the sleeve 1l and shaft 13, and hencer the plate 16, by means of which latter. the plunger 3 is drawn forward and moves the tube 33, clos- -ing the communication between the steampipe 3l and the opening 2S, which had previously been open and opening that between the steam-pipe 31 and the opening 2S at the. other end of the cylinder 1. This moves the head l in the opposite direction. To reverse the movement of the chain 20, it is only nec essary to give the toothed wheel 19 and the shaft 13 a halft.urn, thereby changing the di rection of the incline of the enlargement 11': in the openings 9. v

I do not desire to be understood as limiting myself to the details of construction and arrangement as herein described and illnstrated, as it is manifest that variations and modifications may be made in the features of construction and arrangement in the adaptation of the device to various conditions of use without departing vfrom the spirit and scope of my. invention and improvements. I therefore reserve the right to all such variation and modification as properly fall with-v The collar 3G is connected byar ofthe following claims.

I laving thus Adescribed `my invention, I claim and desire to-secure by Letters Patentder, of a*hollow'pistourod,'a piston having parallel channels` therethrough intersecting recesses inthe piston, rollers in said recesses, and a gripping device rotatably mounted within the piston, and coperating with said. rollers. 1

2. The combination with an engine provided with a cylinder vand a hollow piston-rod working in said jcylinder, of a pistou-head having two parallel channels therethrough, recesses adjacent to said channels, rollers in saidv recesses projecting into said channels,

face rotatably'mounted in saidv head between said channels and forming part of each.

3.V In an engine provided with a cylinder and a hollow piston-rod, a piston-head provided wit-h two channels, recesses opening into said channels, rollers `in said recesses and projecting. into said channels, and -a longitudinally-inclined cylindrical surface rotatably mounted between said channels 'and forming face. v-

4. The combination with an c ngine-cylinder, of a hollow pistofnuod, a piston having parallel `channels therethrough intersecting recesses yin the pistoiniolleis in said recesses, and a rotatable inclined cylindrical gripping device coperating with said rollers.

In ah engine provided with a cylinder and a hollow pistourod, .a piston-head provided with two channels, recesses opening into said channels, rollers in said recesses and projectinginto said channels, and a longitudinally-inclined cylindrical surface rotatably mounted between said channels and fox-min g part of each; a shaft connected with said cylindrical surface and extending through said piston-rod and provided at its end with agear; and a handle carryinga gear meshing with said shaft-gear. Y

' G. In an engine, acylinder having one end open, and a hollow piston-rod working therein and provided with a head having channels therethrough, recesses containing rollers projecting into said channels and an inclined plan-e forming the wall of said channels opposit-e said rollers.

7. The combination with motor mechanism, of a pair of wheels, cylinders between said wheels, holiow-\ piston-rods operable in said cylinders and provided with heads having channels therethrough with a roller on one a drive-belt passingover said wheels and through said channels and pistonaods and `adapted to be gripped between saidrollers and said inclined planes. A

Srdn combination with'mechanism cmhodyinga pair of spaced wheels and a cylinin the scopeof my invention and the terms 1. The combination with an engine-cyliuside and an inclined plane on the other, and` and a longitudinally-inelned cylindrical surpart of each, and means for rotating said surl IOC IIO

der between said wheels hollow'piston-rod operable insaid cylinder'and provided with 'a head having channels 1y therethrough, recesses at the sides of saidchannels with roll- 5 ers therein and inclined surfaces on the sides of said channels opposite said`rollers; and a sprocket-chain passing over said wheels yand through said channels between the rollers and inclined planes.V f nu L v 9. In an engine, comprising a pair of wheels and a cylinder between them, a hollow piston; rod operable in said cylinder and .provided with a. head having channels therethrough and -recesses having rollers therein at the sides of said channels and 'inclined planes op posite said recesses, and a sprocket-chain passing over said wheels and througl.. said channels, and adapted to be gripped between the rollers and the inclined planes. .j 2o 10. In an engine,co1nprisingapairofwheels, a cylinder between said wheels, and a hollow piston-rod operable in said cylinder, a piston# head having channels therethrough and bored transversely to saichannels to form seats for rollers and longitudinally between said vchannels to inoun a rotatable shaft; having an enlarged 'orion with its exterior surface inclined to tl e asis of lheshaftand forming one side of said channels.

v11. In an engine provided with a pistonhead having chaume-is herethrongh with rollers on one side and an inclined surface on n the other, a spro-:eI-chain passing through said channels and caving the su rface toward the inclined plane smooth and the surface toward the rollers provided with transverse depressions. .A l

In testimony whereof l have signed my name in the preseaceof the subscribing Witmesses.

IIA'RTWELL P. HEATH, JOHNl Ms Hocfui. 

